Biology Quiz for Grade 9

What is the structure of DNA?

• Square shape

• Single strand

• Double helix

• Triple helix

Describe the structure of RNA.

• RNA is a double-stranded molecule made up of nucleotides.

• RNA is a single-stranded molecule made up of nucleotides.

• RNA is a protein made up of amino acids.

• RNA is a type of carbohydrate made up of glucose.

Explain the function of RNA in the cell.

• RNA is responsible for energy production in the cell

• RNA helps in cell division and replication

• RNA is involved in the synthesis of carbohydrates in the cell

• RNA carries genetic information from DNA to the ribosomes for protein synthesis.

What is a Punnett square and how is it used in genetics?

• A Punnett square is a type of dance used to determine genetic traits

• A Punnett square is a type of board game used to study genetics

• A Punnett square is a diagram used to predict the possible genotypes of offspring in a genetic cross.

• A Punnett square is a type of food used to represent genetic combinations

How is genetic inheritance determined?

• By the combination of genes from one parent

• By the combination of environmental factors

• By the combination of genes from both parents

• By the combination of traits from both parents

What are the components of a DNA molecule?

• Proteins

• Nucleotides

• Carbohydrates

• Lipids

Differentiate between DNA and RNA.

• DNA is double-stranded with deoxyribose sugar and thymine, while RNA is single-stranded with ribose sugar and uracil.

• DNA and RNA are both double-stranded with deoxyribose sugar and thymine.

• DNA and RNA are both single-stranded with ribose sugar and uracil.

• DNA is single-stranded with ribose sugar and uracil, while RNA is double-stranded with deoxyribose sugar and thymine.

Provide an example of genetic inheritance using a Punnett square.

• Heterozygous (Rr) crossed with another heterozygous (Rr)

• Homozygous dominant (RR) crossed with homozygous recessive (rr)

• Homozygous dominant (RR) crossed with heterozygous (Rr)

• Homozygous recessive (rr) crossed with heterozygous (Rr)

How does RNA differ from DNA in terms of function?

• RNA is involved in protein synthesis and gene expression, while DNA stores genetic information.

• RNA and DNA have the same function in the cell

• RNA is not involved in gene expression

• DNA is involved in protein synthesis

Explain the concept of dominant and recessive alleles in genetic inheritance.

• Dominant and recessive alleles have equal strength

• Dominant alleles are the stronger form of a gene and are always expressed, while recessive alleles are only expressed when there are no dominant alleles present.

• Recessive alleles are always expressed

• Dominant alleles are weaker and are never expressed